[CRIU] Re: [PATCH] tcp: restore rcv_wscale in a repair mode (v2)

[Pavel Emelyanov]

On 09/18/2012 12:12 PM, Andrew Vagin wrote:
> rcv_wscale is a symetric parameter with snd_wscale.
> 
> Both this parameters are set on a connection handshake.
> 
> Without this value a remote window size can not be interpreted correctly,
> because a value from a packet should be shifted on rcv_wscale.
> 
> And one more thing is that wscale_ok should be set too.
> 
> This patch doesn't break a backward compatibility.
> If someone uses it in a old scheme, a rcv window
> will be restored with the same bug (rcv_wscale = 0).
> 
> v2: Save backward compatibility on big-endian system. Before
>     the first two bytes were snd_wscale and the second two bytes were
>     rcv_wscale. Now snd_wscale is opt_val & 0xFFFF and rcv_wscale >> 16.
>     This approach is independent on byte ordering.
> 
> CC: Pavel Emelyanov <xemul at parallels.com>
> Signed-off-by: Andrew Vagin <avagin at openvz.org>

Cyrill, plz, push this patch to kernel repo.